<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,user-scalable=no">
    <title>Document</title>
    <style>
    body {
        margin: 0;
    }
    
    header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 75px;
        background-color: black;
    }
    
    section {
        position: relative;
        margin-top: 75px;
        height: 1000px;
    }
    </style>
</head>

<body>
    <header></header>
    <section>
    </section>
</body>

</html>
